Abstract Floor-fractured craters are one of the most distinct features on Ceres. Most of the fractures are located on the crater floors. The floor-fractures are concentric, radial or polygonal and share similarities with the floor-fractured craters (FCC) of Class 1 and 4 on the Moon (e.g., Buczkowski et al., 2018; Schultz, 1976) In total we measured 2336 fractures in thirteen craters. We analyzed their width, length, orientation and density. Floor-fractures on Ceres do not show a global uniform sense of orientation. Nevertheless, two or more preferred orientations can be found in nearly every crater. The density map illustrates that there is typically no decrease of fracturing from the crater center to the crater rim and denotes formation mechanisms that are not necessarily impact driven. Because of the variation in these parameters, it is more likely that FFC on Ceres are globally independent and show different formation mechanisms. The geometry of the floor-fractures suggests an inhomogeneous, brittle surface material, in some cases with volatile components. We also propose that the formation mechanisms on Ceres are comparable to those on the Moon and Mars and such mechanisms include cooling/melting processes, degassing, and subsidence of the crater floor by up-doming of subsurface material as a result of absolute tensile stresses.

中文翻译：

---

谷神星底部裂缝的裂缝几何形状和统计

摘要 地面破裂的陨石坑是谷神星上最明显的特征之一。大多数裂缝位于火山口底部。底板裂缝是同心的、放射状的或多边形的，与月球上第 1 类和第 4 类底板裂缝陨石坑 (FCC) 有相似之处（例如，Buczkowski 等人，2018 年；Schultz，1976 年）我们总共测量了 2336 条裂缝在十三个陨石坑中。我们分析了它们的宽度、长度、方向和密度。谷神星上的地板裂缝没有显示出全球统一的方向感。尽管如此，几乎在每个陨石坑中都可以找到两个或更多的首选方向。密度图说明从火山口中心到火山口边缘的裂缝通常没有减少，并表示不一定是由撞击驱动的形成机制。由于这些参数的变化，更可能的是，谷神星上的 FFC 是全局独立的，并表现出不同的形成机制。底板裂缝的几何形状表明表面材料不均匀，易碎，在某些情况下含有挥发性成分。我们还提出，谷神星上的形成机制与月球和火星上的形成机制相当，这些机制包括冷却/熔化过程、脱气和陨石坑底部下沉，这是由于绝对拉应力导致地下物质向上拱起。